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Originally Posted by badass3000
Jake, yeah TPS switch is bad, but I dont think that could be it.
I bought one from someone, but received a TPS that had only 3 pins, and guess what the missing pin is wired for, yep the idle switch.
VSPD is vehicle speed???
its jumping around faster than an O2 sensor at idle!
whats that all about?
I remember hooking up a water temp gauge around the time this started. Could the sensor that I unhooked be in any way related to this???
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I havent put too much thought into your problem and how it could be related to a bad tps, but off the top of my head since the idle position switch is bad the ecu might somehow think the throttle is at idle when its really not. Chances are this is nothing, as the ecu still has the tps step counts to go by, but I'm just thinking out loud.
And as for your vehicle speed, I really doubt that matters, considering mine has been FUCKED for years now - my turbo timer is wired into my speed sensor, so it reads the signal and outputs my speed in kph. Sometimes (rarely) my speedo works normally, most of the time I see 0kph no matter what speed I'm going, and most of the time the speed will bounce around crazy, reading anywhere from 0 to 399kph. When the reading is bouncing around on the turbo timer, usually my speedometer just sits at 0mph. Sometimes on the turbo timer it sticks at 399kph too. The even weirder thing is that sometimes my speedometer will read how it should, yet the kph reading on the turbo timer is bouncing around. So the speedo and turbo timer dont respond the same, even though they are both getting the same input signal. I havent datalogged my car in ages, but I think it read crazy too. I just dont care since my car still drives fine. But what I'm getting at from all this is that since the screwed up vss readings dont affect my driveability, then I would assume they shouldnt affect yours either.
Does your speedo work right?
Since we are now basically guessing as to what the problem could be, why not try and unplug the speed sensor at the trans and see if anything happens. I think you might get a check engine light and a code, but just ignore that for the time and see if unplugging it helps fix the misfire.
And as for the water temp gauge, I trashed my stock water temp gauge and sender and installed an aftermarket one too, with no ill effects on driveability. The stock water temp gauge sender isnt even seen by the ecu anyway, it has its own water temp sender so its not part of the problem either. And since your datalog shows 189 degrees, then yours appears to be working correctly.